uniform sampler2D uni_sampler2D_back;
uniform sampler2D uni_sampler2D_front;
varying vec2 var_vec2_texcoord0;

void main()
{
    vec4 back=texture(uni_sampler2D_back,var_vec2_texcoord0);
    vec4 front=texture(uni_sampler2D_front,var_vec2_texcoord0);
	gl_FragColor=back*front.a+front*(1-front.a);
}
